I am running Ubuntu V11.10 on a Dell Latitude D505 laptop and have been using an HP C7200 series printer with a duplex facility. It has been working well and I find the HP Device Manager very useful.

I upgraded from version 3.13.3 to 3.13.4 just now and find that I can no longer use duplex. Under "Print Settings/General" double-sided is listed as the default (attached screenshot).Under "Print settings / Installable options" it says "Duplexer Installed", but the greyed out radio buttons show the default as "off" . (screenshot 2)

Running hp-check in a terminal (attachment) looks OK except for:a) Current contents of '/var/lib/hp/hplip.state' file:Plugins are not installed. Could not access file: No such file or directory b) and another, offline printer

How can I reactivate Duplex? A web search hasn't helped, and I would be grateful for assistance.

I'm baffled why anyone would mess with a working hplip version ?(actually I don't understand why anyone would install hplip from the hplip website, unless the version in the repos wasn't recent enough for their printer)

I'm baffled why anyone would mess with a working hplip version ?(actually I don't understand why anyone would install hplip from the hplip website, unless the version in the repos wasn't recent enough for their printer)

HP Device Manager invited me to do so, so I just pressed the install button that it offered me as having the latest version seemed a good idea. Here's the output:dpkg -l | grep hpliprc hplip 3.11.7-1ubuntu3.1 HP Linux Printing and Imaging System (HPLIP)

I've no objection to uninstalling it and getting it from the repository.

The box was unticked and ticking it worked a treat. There seems to be a number of useful terminal HP commands - is there a list anywhere that I can peruse and experiment? I haven't found anything on the web.

Ah! Sorry to trouble you again.Exploring all the HP Device Manager properties indicates that "(Ink) Supplies information is not available for this device". Any chance of fixing that? It's not the end of the world, if not, but it's nice to be able to anticipate low-ink warnings.

hp-levels -p Photosmart_C7200Does indeed show the ink levels. As the commands starts to display text, it includes the statement:error: Invalid printer name: Photosmart_C7200but then proceeds to display the levels correctly, which is odd.

lpstat -p -dprinter Photosmart_C7200 is idle. enabled since Tue 09 Apr 2013 19:19:20 BST ready to printwhich is the correct printer. The command "hp+Tab" did not produce any response at all but I shall play around with that one now that I know where the info is.Many thanks again for your help.

Yep; I understood correctly: type "hp" then hit Tab. There is no response, but I am sure that it has in the past when I discovered it by accident. I've just tried it on a desktop running V12.04 and it doesn't work on that, either. It is not an urgent problem, so if anything occurs to you some time, I would be grateful for ideas. In the meantime, the list that you provided will be very useful!Thank you for taking the trouble.

Funny you should mention that! I was just sitting down to tell you that I had discovered it by accident a few seconds ago, when your message appeared! Very many thanks for your help, Mark - it's much appreciated. Speaking of which, I have this other problem...... but that will be another post!